Chronic Urticaria Clinical Presentation
- Author: Daniel J Hogan, MD; Chief Editor: William D James, MD more...
History
An important historical characteristic of urticarial lesions is their transient nature. An individual wheal typically lasts for less than 24 hours. Pruritus is the most common associated symptom. If lesions last longer and are associated with pigmentary changes or symptoms (eg, pain or burning), consider performing a biopsy to exclude urticarial vasculitis.
Individual wheals last less than 1 hour in persons with physical urticaria, except for delayed pressure urticaria, in which individual wheals last at least 8-48 hours, especially on the palms and soles.
Physical
The typical lesion of urticaria is a pale-to-red, well-demarcated papule or plaque. Lesions may be round, oval, annular, arcuate, serpiginous, or generalized. They resolve without postinflammatory pigmentary changes or scaling. Note the following:
- Primary lesion: They are edematous erythematous papules or plaques with a pale center (wheal) and surrounding erythema (flare).
- Distribution of lesions: Lesions can be localized or generalized.
- Color of lesions: Depending on background skin color, lesions may be pale to red.
- Differentiation: Stroking the skin firmly tests for symptomatic dermatographism. Exercise testing can confirm cholinergic urticaria. Application of an ice cube to the skin may test for cold urticaria.
Causes
A number of factors have been reported to cause chronic urticaria, and these include the following:
- Medications: Urticaria may be caused or exacerbated by a number of drugs. More common culprits include aspirin, other nonsteroidal anti-inflammatory drugs, opioids, ACE inhibitors, and alcohol.
- Contactants: Contact urticaria syndrome refers to the onset of urticaria within 30-60 minutes of contact with an inciting agent. The lesions may be localized or generalized. Precipitating factors include latex (especially in health care workers), plants, animals (eg, caterpillars, dander), medications, and food (eg, fish, garlic, onions, tomato).
- Foods and food additives: Some patients report the onset of acute urticaria associated with the consumption of certain foods, such as shellfish, eggs, nuts, strawberries, or certain baked goods.
- Arthropod assault: Arthropod assault is the most common cause of papular urticaria. Although patients who are bitten by mosquitoes are likely to be aware of the source of the problem, patients with scabies, bedbug bites, flea bites, or other similar problems may not be aware. Ask patients about exposure to animals, recent moves, hobbies, travel, or the presence of a similar skin condition in other members of the household.
- Infections: Urticaria has been reported to be associated with a number of infections; however, these associations are not strong and may be spurious. Infectious agents reported to cause urticaria include hepatitis B virus, Streptococcus and Mycoplasma species, Helicobacter pylori,[8, 9] Mycobacterium tuberculosis, and herpes simplex virus.
- Autoimmune disease: Urticaria has been associated with a number of autoimmune diseases, including systemic lupus erythematosus, cryoglobulinemia, juvenile rheumatoid arthritis, and autoimmune thyroid disease, including Graves disease.[10, 11] Patients may be euthyroid but respond to replacement therapy or may respond to treatment of hyperthyroidism with carbimazole.
- Autoinflammatory diseases: Urticaria is a feature of Muckle-Wells syndrome (amyloidosis, nerve deafness, and urticaria) and Schnitzler syndrome[12] (fever, joint/bone pain, monoclonal gammopathy, and urticaria).
- Malignancies: Little evidence exists to support the concern that chronic urticaria is a cutaneous sign of occult internal malignancy. In a study of 1155 patients with chronic urticaria in Sweden, Sigurgeirsson found no association with cancer, although acquired angioedema associated with C1 inhibitor depletion may be associated with malignancy.[13]
- Physical factors: Physical factors are the most commonly identified etiologies of chronic urticaria, accounting for approximately 20% of cases. The various types of physical urticaria are diagnosed by challenge testing. Several types exist, and finding that a single patient has more than 1 type is not uncommon. Below is a list of some types of physical urticaria and their causes:
- Dermatographism/dermographism - Firm stroking
- Delayed pressure urticaria - Pressure
- Cold urticaria - Cold
- Aquagenic urticaria - Water exposure
- Cholinergic urticaria - Heat, exercise, or stress
- Solar urticaria - Sun exposure
- Vibratory urticaria - Vibration
- Neurologic factors: An Italian study reported an association between chronic urticaria and fibromyalgia. The authors proposed that chronic urticaria is a consequence of fibromyalgia-neurogenic skin inflammation.[14]
- Emotional factors: Psychological factors are reported to play a role in a number of patients. Reports exist of improvement of symptoms using hypnotism; however, the role of emotional factors remains controversial.
- Genetic: Hereditary angioedema is characterized by recurrent attacks of angioedema (without urticaria) involving the skin, GI tract, respiratory tract, and mucous membranes in a patient with a positive family history. The disorder is autosomal dominant, and it is caused by a functional deficiency of the C1 inhibitor protein.
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